cleanup: remove dead pos=0 reassignment and demote chat logs to DEBUG

Quest log had a redundant pos=0 right after initialization. Chat handler
logged every incoming/outgoing message at WARNING level, flooding the
log and obscuring genuine warnings.

src/ui/quest_log_screen.cpp

@@ -35,7 +35,6 @@ std::string replaceGenderPlaceholders(const std::string& text, game::GameHandler
 
     // Replace $g placeholders
     size_t pos = 0;
-    pos = 0;
     while ((pos = result.find('$', pos)) != std::string::npos) {
         if (pos + 1 >= result.length()) break;
         char marker = result[pos + 1];